XML 41 R28.htm IDEA: XBRL DOCUMENT v3.10.0.1
Derivative Financial Instruments - Fair Value of Derivative Instruments Included in Condensed Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Jul. 28, 2018
Apr. 28, 2018
Derivatives, Fair Value [Line Items]    
Interest rate contracts, assets, fair value $ 1,470 $ 1,613
Interest rate contracts, liabilities, fair value 1,470 1,613
Other Noncurrent Assets | Interest Rate Contracts    
Derivatives, Fair Value [Line Items]    
Interest rate contracts, assets, fair value 1,470 1,613
Other Noncurrent Liabilities | Interest Rate Contracts    
Derivatives, Fair Value [Line Items]    
Interest rate contracts, liabilities, fair value $ 1,470 $ 1,613